High disk utilization leading to excessive latency

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Category:: aff-series

Specialty:: hw

Last Updated:

Applies to

AFF8080
ONTAP 9.5P7
Disk X356_TPM4V3T8AME

Issue

Multiple recovered errors reported by the disk

Mon Aug 17 17:13:12 CEST [node1: slifc_intrd: scsi.cmd.checkCondition:error]: Disk device switch1:7.126L523: Check Condition: CDB 0x88:0000000170d2d968:00000048: Sense Data SCSI:recovered error -  (0x1 - 0x18 0x0 0x0)(81).

Mon Aug 17 17:13:12 CEST [node1: disk_server_0: disk.ioRecoveredError.retry:info]: Recovered error on disk switch1:7.126L523: op 0x88:0000000170d2d968:00000048 sector 6187833728 SCSI:recovered error - Disk used internal retry algorithm to obtain data (1 18 0 0) (81) Disk switch1:7.126L523 Shelf 15 Bay 22 [NETAPP   X356_TPM4V3T8AME NA01] S/N [XXXXXXXXXXXX] UID [58XXXXE:20YYYYC:00000000:00000000:00000000:00000000:00000000:00000000:00000000:00000000]

Output of qos statistics volume latency show shows highest value under Disk column

Example:

cluster::> qos statistics volume latency show

Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud  FlexCache    SM Sync

--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

vol1                 -      100ms        2ms        2ms        0ms       95ms        1ms        0ms        0ms        0ms        0ms

-total-              -      100ms        2ms        2ms        0ms       95ms        1ms        0ms        0ms        0ms        0ms